import { Quaternion } from './Quaternion.js';
import { Matrix4 } from './Matrix4.js';
import { clamp } from './MathUtils.js';

const _matrix = /*@__PURE__*/ new Matrix4();
const _quaternion = /*@__PURE__*/ new Quaternion();

class Euler {
  constructor(x = 0, y = 0, z = 0, order = Euler.DEFAULT_ORDER) {
    this.isEuler = true;

    this._x = x;
    this._y = y;
    this._z = z;
    this._order = order;
  }

  get x() {
    return this._x;
  }

  set x(value) {
    this._x = value;
    this._onChangeCallback();
  }

  get y() {
    return this._y;
  }

  set y(value) {
    this._y = value;
    this._onChangeCallback();
  }

  get z() {
    return this._z;
  }

  set z(value) {
    this._z = value;
    this._onChangeCallback();
  }

  get order() {
    return this._order;
  }

  set order(value) {
    this._order = value;
    this._onChangeCallback();
  }

  set(x, y, z, order = this._order) {
    this._x = x;
    this._y = y;
    this._z = z;
    this._order = order;

    this._onChangeCallback();

    return this;
  }

  clone() {
    return new this.constructor(this._x, this._y, this._z, this._order);
  }

  copy(euler) {
    this._x = euler._x;
    this._y = euler._y;
    this._z = euler._z;
    this._order = euler._order;

    this._onChangeCallback();

    return this;
  }

  setFromRotationMatrix(m, order = this._order, update = true) {
    // assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

    const te = m.elements;
    const m11 = te[0],
      m12 = te[4],
      m13 = te[8];
    const m21 = te[1],
      m22 = te[5],
      m23 = te[9];
    const m31 = te[2],
      m32 = te[6],
      m33 = te[10];

    switch (order) {
      case 'XYZ':
        this._y = Math.asin(clamp(m13, -1, 1));

        if (Math.abs(m13) < 0.9999999) {
          this._x = Math.atan2(-m23, m33);
          this._z = Math.atan2(-m12, m11);
        } else {
          this._x = Math.atan2(m32, m22);
          this._z = 0;
        }

        break;

      case 'YXZ':
        this._x = Math.asin(-clamp(m23, -1, 1));

        if (Math.abs(m23) < 0.9999999) {
          this._y = Math.atan2(m13, m33);
          this._z = Math.atan2(m21, m22);
        } else {
          this._y = Math.atan2(-m31, m11);
          this._z = 0;
        }

        break;

      case 'ZXY':
        this._x = Math.asin(clamp(m32, -1, 1));

        if (Math.abs(m32) < 0.9999999) {
          this._y = Math.atan2(-m31, m33);
          this._z = Math.atan2(-m12, m22);
        } else {
          this._y = 0;
          this._z = Math.atan2(m21, m11);
        }

        break;

      case 'ZYX':
        this._y = Math.asin(-clamp(m31, -1, 1));

        if (Math.abs(m31) < 0.9999999) {
          this._x = Math.atan2(m32, m33);
          this._z = Math.atan2(m21, m11);
        } else {
          this._x = 0;
          this._z = Math.atan2(-m12, m22);
        }

        break;

      case 'YZX':
        this._z = Math.asin(clamp(m21, -1, 1));

        if (Math.abs(m21) < 0.9999999) {
          this._x = Math.atan2(-m23, m22);
          this._y = Math.atan2(-m31, m11);
        } else {
          this._x = 0;
          this._y = Math.atan2(m13, m33);
        }

        break;

      case 'XZY':
        this._z = Math.asin(-clamp(m12, -1, 1));

        if (Math.abs(m12) < 0.9999999) {
          this._x = Math.atan2(m32, m22);
          this._y = Math.atan2(m13, m11);
        } else {
          this._x = Math.atan2(-m23, m33);
          this._y = 0;
        }

        break;

      default:
        console.warn(
          'THREE.Euler: .setFromRotationMatrix() encountered an unknown order: ' +
            order
        );
    }

    this._order = order;

    if (update === true) this._onChangeCallback();

    return this;
  }

  setFromQuaternion(q, order, update) {
    _matrix.makeRotationFromQuaternion(q);

    return this.setFromRotationMatrix(_matrix, order, update);
  }

  setFromVector3(v, order = this._order) {
    return this.set(v.x, v.y, v.z, order);
  }

  reorder(newOrder) {
    // WARNING: this discards revolution information -bhouston

    _quaternion.setFromEuler(this);

    return this.setFromQuaternion(_quaternion, newOrder);
  }

  equals(euler) {
    return (
      euler._x === this._x &&
      euler._y === this._y &&
      euler._z === this._z &&
      euler._order === this._order
    );
  }

  fromArray(array) {
    this._x = array[0];
    this._y = array[1];
    this._z = array[2];
    if (array[3] !== undefined) this._order = array[3];

    this._onChangeCallback();

    return this;
  }

  toArray(array = [], offset = 0) {
    array[offset] = this._x;
    array[offset + 1] = this._y;
    array[offset + 2] = this._z;
    array[offset + 3] = this._order;

    return array;
  }

  _onChange(callback) {
    this._onChangeCallback = callback;

    return this;
  }

  _onChangeCallback() {}

  *[Symbol.iterator]() {
    yield this._x;
    yield this._y;
    yield this._z;
    yield this._order;
  }
}

Euler.DEFAULT_ORDER = 'XYZ';

export { Euler };
